Apparatus for cleaning hollow metal rods.



.D. W. DUNLEVY. APPARATUS FOR CLEANING HOLLOW METAL RODS.

APPLICATION FILED JULY 22.1916.

Patented July 3, 1917.

r rrnn s ra r ns ra rnn r ounce.

DAVID W. DUNLEV'Y, F PITTSBURGH, IENNSYLVANIA, ASSIGNOR TO COLONIAL STEEL COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPQBATION OF PENNSYLVANIA APPARATUS FOR CLEANING HOLLOW METAL RODS.

Specification of Letters latent.

Patented Jul 3, on.

Application filed July 22, 1916. Serial No. 110,679.

.To all whom it may concern:

Be it known that I, DAVID IV. Donnnvr, a citizen of the United States, and resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Apparatus for Cleaning Hollow Metal Rods; and I do hereby declare the following tobe a full, clear, and exact description thereof.

My invention relates to the cleaning of hollow metal rods, bars, and the like, from the sand or other refractory material in the core, around which the bars are formed One inethod of forming hollow metal bars is by drilling a central hole in the bloom or billet; filling the same with sand or other refractory material; closing the ends thereof; and heating and. rolling out'the bar to finished form. Such bars are used for hollow drill steel, or for other suitable purposes.

The object of the invention is to provide means for removing the sand or like core from the bar so formed. It consists, generally stated, in a hollow support for the tube to be cleansed, feed-rolls mounted in line with the tube, a cylinder in line with said feed-rolls, an inner telescoping tube within the cylinder and engaging the/feedrolls and'entering the tube to be cleansed, and. a reservoir for water under pressure communicating. with the ovlinder, It also comprises certain other improvements as hereinafter more particularly set forth and claimed.

In the accompanying drawing, Figure 1 is a side view of the apparatus embodying the invention; Fig. 2 top or plan view thereof; Fig. 3 is an enlarged longitudinal section of'the main operating parts; Fig. a is a view of the'feed-rolls; and Fig. 5 is a longitudinal section of the bar or tube to be cleansed, showing the telescoping tube ope 'ating therein.

The tube or bar 1 to be cleansed rests on suitable standards 2 in line with the hollow support 3, its end being secured to the support by passing through a suitable lined bushing 4 being rigidly secured therein by means of a clamping bolt The support has leadin therefrom a suitable drain 6 for carrying core washed from the tube, and the water used for such washing operation. In line with the bushing .4 are the feed-r0lls 7, Which are shown as hand-driven and which may off the refractory material of the be power-driven in any suitable manner, there being two of such feed-rolls mounted in a suitable frame 8 secured to the hollow support 3, and the roll trunnions carrying the pinions 9, which mesh with each other, sothat through the handle 10 the telescoping tube 11 may be gradually fed tlirough the rod or tube 1 to be cleansed, as hereinafter described. .The feed-rolls 7 are grooved as at 12, two of such grooves are shown, adaptlng the rolls to be used with different sizes of telescoping tubes. These rolls engage with the telescoping tube 11 to feed it forard at the desired. speed or withdraw it from the hollow bar or tube after the cleansing thereof. In cleaning the larger sizes of rods the largest. groove of the rolls is employed, the roll frame being adjustably secured to the support 3 by slot-andbolt connection is shifted to bring the pass into register with the bushing *1. A larger tube 11. and stutiing is substituted for the smaller and the liner *1 removed from the bushing Jr. This inner telescoping tube 11 is mounted in the long cylinder 13 supported in suitable standards 1%, and having at its rear end the valve 15 communicatingwith the water reservoir lb. The reservoir communicates with any suitable source of water-supply under high pressure, which is not shown.- For the convenience of the operator, the valve 15 is operated by the hand lever 17 through suitable connecting-rods 18, said hand-lever being located in' convenient position for the workn'ian. The cylinder 13 and the inner telescoping tube 11 are of any suitable length according to the rods or bars to be operated upon. The inner telescoping tube is preferably made-of light steel tubing somewhat smaller than the bore of the hollow rod or tube to be cleansed, and it is mounted loosely in the cylinder 13, passing through a stuffing-box 19 at the end of the cylinder. It is preferred that the inner tube 11 shall have its inclosed end enlarged 'or flared the inner tube 11 is fed ,to beoperated upon so that rod or tube 1 to be operatedupon has its solid ends cut or broken off, exposing the inner sand core 22 (see Fig. 5). The hollow rod is then placed on the standards 2 and se cured Within the clamping-bushing 4: and by the feed-rolls 7 across the hollow support 3 and entered into the hollow rod or tube, and by the operation of the valve 15, the water under high pressure is admitted to the cylinder 13; and as the inner tube 11 is gradually fed forward, this water under high pressure impinges upon the sand or other refractory material, tliea'efractory material and 'water escaping from the hollow rod into the receptacle 3 and thence through the drain (3. The inner tube 11 isthus gradually fed forward while the refractory core is being washed out and until the tube passes entirely through the hollow rod or tube; the inner tube being,

to the sand core the full force of the stream of water under pressure operates upon-and washes out the same. If the hollow rod to be cleansed is of too great length,

preferably maintained close it may be washed out for part of its length and then reversed and the remainder of the core then washed out. \Vhen the core is thus broken through, the stream of water escaping through the hollow rod will wash out any remaining portion of the sand or other refractory material.

The feeding of the inner tube 11 through the cylinder l3-1'nay be aided or accomplished by the enlarged innergend 20 of the inner tube traveling within the cylinder. However, it is necessary to have the feedrollers for the withdrawal of the telescoping tube after the operation is completed, and such feeding through the pressure of the waterand within the cylinder is not entirely depended upon.

The operation is rapid, and while high pressures of liquid are employed, the tube is thoroughly cleansed by the water flowing backwardly around the inner tube 11 entering the hollow rod. and as the refractory material is thoroughly moistened or Wetted 2. In apparatus for cleansing: tubing, the

combination of a hollow support for the tube to be 'cleansed,a cylinder in line with said support, an inner tube telescoping within the cylinder and adapted to enter the tube to be cleansed, and a reservoir for water under pressure communicating with the cylinder.

In apparatus for cleansing tubing, the combination of a hollow support for a tube to be cleansed, a cylinder in linev'ith said support, an inner tube telescoping within the cylinder and engaging the feed-rolls and adapted 'to enter the tube to be cleansed, a reservoir for water under pressure communicating with the cylinder, the inner tube having an enlarged end traveling within the cylinder. 4. In apparatus for cleansing hollow rods or tubes, the combination of port for the tube to becleansed, a clampingbusbing for connecting the tube with said hollow support, standards for supporting the hollow rod, a tube adapted to enter the bore of the hollow rod and. cleanse the re frartory core therefrom, and an abutment in line with the hollow rod when supported on the standards.

In testimony whereof, I the said DAVID IV. DUNLEVY, have hereunto set my hand.

DAVID w. DUNL-EVY.

Copies of this patent may be obtained for five cents each, by addressing" the "Commissioner of, Patents, Washington, D. 0. 

